Question

sec 70. Sin 20+ Cos 20Coscec 70 ​

Answer 1

Answer:

0

Step-by-step explanation:

sec70 X sin20 - cos20 X cosec70

= 1/cos70 X cos(90-20) - sin(90-20) X 1/sin70

=cos70/cos70 - sin70/sin70

=1-1

=0

Answer 2

Answer:

2

Step-by-step explanation:

sec70sin20 + cos20cosec70

sec(90 - 20)sin20 + cos(90- 70)cosec70

cosec20sin20 + sin 70cosec70

1+1

2